CN210668510U

CN210668510U - Fire extinguishing device used on battery top cover, battery top cover and battery

Info

Publication number: CN210668510U
Application number: CN201921595784.1U
Authority: CN
Inventors: 刘岩; 潘启明; 林亮; 丁伟刚; 陈小潭
Original assignee: Shenzhen Bak Power Battery Co Ltd
Current assignee: Shenzhen Bak Power Battery Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-06-02
Anticipated expiration: 2029-09-24

Abstract

The utility model relates to the technical field of batteries, in particular to a fire extinguishing device used on a battery top cover, the battery top cover and a battery, wherein the fire extinguishing device comprises a guide mechanism and a fire baffle plate which is slidably arranged on the guide mechanism; the fire damper further comprises an elastic piece, a first magnetism sensing piece and a second magnetism sensing piece, and under a normal state, the second magnetism sensing piece and the first magnetism sensing piece attract each other to compress the elastic piece so that the fire damper is located at a first position; when the temperature of the battery exceeds a preset value, the magnetism of the first magnetic sensing piece and/or the second magnetic sensing piece is weakened or disappears, the elastic piece recovers to deform to enable the fire baffle to be located at the second position, the fire baffle located at the second position is used for blocking the valve port of the first safety valve, the valve port of the first safety valve is sealed, the contact between combustible materials inside the battery and air is isolated, the fire extinguishing effect is achieved, and therefore the safety of a user is guaranteed. This extinguishing device's the mode of triggering and the current device that needs to adopt gas to trigger to put out a fire compare, trigger more sensitively, and the security is higher.

Description

Fire extinguishing device used on battery top cover, battery top cover and battery

Technical Field

The utility model relates to a battery technology field, concretely relates to a extinguishing device, battery top cap and battery for on battery top cap.

Background

With the increasing severity of energy crisis and environmental pollution problems, new energy vehicles are more and more favored by various countries by virtue of the great advantages in energy conservation and emission reduction. The electric automobile is the main body of the new energy automobile at present, and the power battery is the most important power source of the electric automobile. Lithium ion batteries are becoming the mainstream of power batteries for electric vehicles due to their high specific energy and long service life. However, the safety accident of the lithium ion battery which is characterized by the thermal runaway of the monomer occurs sometimes, and the large-scale application of the electric automobile is limited.

Thermal runaway refers to the phenomenon that the battery temperature rises uncontrollably until explosion and fire happen due to the heat release chain reaction of the battery monomer. When the battery is in abnormal working conditions, such as overcharge and overdischarge, and is used in a high-heat environment, the electrode material and the electrolyte generate corresponding side reactions and generate a large amount of gas, meanwhile, the battery shell continuously expands along with the increase of internal air pressure, and the battery can explode and ignite when the battery cannot expand to break through a volume critical state, so that a serious safety problem is caused.

In the case of a prismatic battery, in order to prevent the battery from causing a serious safety problem when thermal runaway occurs, a safety valve is generally designed in the prismatic battery. When the battery produces gas to make the internal pressure reach a certain value, the safety valve is opened to release the pressure, so that the gas in the battery is released, and the battery is prevented from further expansion to explode and catch fire. However, when the safety valve is opened by excessive internal pressure of the battery, gas inside the battery is released at an extremely high rate with the electrolyte, and severe friction is generated at the opening of the safety valve. When the temperature generated by high-speed friction reaches the flash point of the electrolyte, the electrolyte can detonate, at the moment, although the battery cannot explode, the battery can continuously catch fire until the combustion of combustible materials in the battery is finished, and the life safety of people is greatly threatened.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that the battery catches fire when thermal runaway among the prior art, endangers personal and property safety, the application provides following technical scheme:

a fire extinguishing device for a battery top cover is provided with a first safety valve, the first safety valve is communicated with the interior of a battery and is used for opening when the pressure difference between the interior and the exterior of the battery is larger than a first threshold value so as to release the pressure of the battery, and the fire extinguishing device comprises a guide mechanism and a fire baffle plate slidably mounted on the guide mechanism;

the fire damper further comprises an elastic piece, a first magnetic sensing piece and a second magnetic sensing piece, at least one of the first magnetic sensing piece and the second magnetic sensing piece is magnetic, the other magnetic sensing piece can be attracted by magnetism, the first end of the elastic piece is relatively fixed, the second end of the elastic piece is connected with one end of the second magnetic sensing piece, and the other end of the second magnetic sensing piece is connected with the fire damper plate;

the second magnetic induction piece and the first magnetic induction piece attract each other to enable the elastic piece to deform so as to store energy, and at the moment, the fire baffle is located at the first position of the guide mechanism and exposes out of the valve port of the first safety valve; when the temperature of the battery exceeds a preset value, the magnetism of the first magnetism sensing piece and/or the second magnetism sensing piece is weakened or disappears, the elastic piece recovers to deform, so that the fire damper plate moves to the second position of the guide mechanism, and the fire damper plate located at the second position is used for blocking the valve port of the first safety valve.

One of the first magnetic sensing piece and the second magnetic sensing piece is a temperature sensing soft magnet, and the other one of the first magnetic sensing piece and the second magnetic sensing piece is a permanent magnet, an iron block, a temperature sensing soft magnet or an electromagnet.

The guide mechanism comprises a first guide part and a second guide part, the first guide part and the second guide part are arranged on the battery top cover in parallel and are respectively positioned at two sides of a valve port of the first safety valve to guide and limit the fire damper; the first position is adjacent to the port of the first relief valve and the second position is above or below the port of the first relief valve.

Specifically, all be provided with a guide way on first guide and the second guide, be equipped with first guide block and second guide block on the corresponding side of fire baffle respectively, first guide block and second guide block slidable mounting respectively in the guide way of first guide and second guide.

Preferably, the guide groove is a trapezoidal groove, and the first guide block and the second guide block are both trapezoidal blocks.

The battery pack further comprises a plurality of second safety valves arranged on the fire damper plate, and the second safety valves are used for automatically opening when the pressure difference between the inside and the outside of the battery is larger than a second threshold value, so that the pressure inside the battery is relieved.

Wherein the elastic member comprises at least one cylindrical spring.

The first magnetism sensing piece is fixed on the battery top cover, and the first end of the elastic piece is fixed on the first magnetism sensing piece.

A battery top cover comprises a top cover bottom plate, wherein a first safety valve is mounted on the top cover bottom plate, communicated with the interior of a battery and used for opening when the pressure difference between the interior and the exterior of the battery is larger than a first threshold value, so that the battery is decompressed; the fire extinguishing device is characterized in that the fire extinguishing device is further installed on the top cover bottom plate.

A battery comprising a fire suppression apparatus as described above or a battery top cover as described above.

According to the fire extinguishing apparatus of the embodiment, in a normal state, the second magnetic sensing piece and the first magnetic sensing piece attract each other to compress the elastic piece, so that the fire baffle is located at the first position, after the battery fires, when the temperature of the battery exceeds a preset value, the magnetism of the first magnetic sensing piece and/or the second magnetic sensing piece is weakened or disappears, the elastic piece recovers to deform, so that the fire baffle slides to the second position along the guide mechanism, at the moment, the fire baffle located at the second position blocks the valve port of the first safety valve, namely, the valve port of the first safety valve is sealed, the contact between combustible materials inside the battery and air is isolated, the fire extinguishing effect is achieved, and therefore the safety of a user is guaranteed.

Drawings

FIG. 1 is a schematic structural diagram of a fire suppression apparatus according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of a first guide of an embodiment of the present application;

FIG. 3 is a cross-sectional view of a fire stop plate according to an embodiment of the present application.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The embodiment of the utility model provides an in, when the battery causes first relief valve to open because of internal pressure is too big, and then when leading to the inside fire of battery, the utility model discloses a fire extinguishing apparatus can effectively seal the valve port of the first relief valve after opening, lets the inside isolated air of battery to prevent the inside combustible substance of battery to continue to burn in order to reach the fire control effect.

Specifically, the utility model discloses utilize first magnetism piece and/or the second of feeling to feel magnetism piece to be heated magnetism and disappear or weaken for the elastic component resumes this characteristic of deformation and controls extinguishing device's switch, and the valve port of the first relief valve after will opening effectively seals, and the contact of the inside combustible substance of isolated battery and air, thereby reaches the effect of putting out a fire. And simultaneously, the utility model has the advantages of simple structure, with low costs, start rapidly, do not influence battery normal use, open the back of starting a fire that leads to because of the relief valve at the battery, can completely cut off the air rapidly, prevent the inside sustained combustion of battery.

The embodiment of the utility model provides an in, arouse first relief valve in order to prevent that battery thermal runaway from causing and continuously spout fire, and then arouse the explosion, threaten to user's life safety, a fire extinguishing apparatus that can self-starting under high temperature is provided, the device includes guiding mechanism and slidable mounting and keeps off the fire board on this guiding mechanism, still include the elastic component, first magnetism spare and second are felt to magnetism spare, the first end relatively fixed of elastic component, the second end is felt the one end of magnetism spare with the second and is connected, the second is felt the other end of magnetism spare and is connected with keeping off the fire board. Under a normal state, the second magnetism sensing piece and the first magnetism sensing piece attract each other to compress the elastic piece, so that the fire damper is located at the first position of the guide mechanism, and the fire damper is far away from the valve port of the first safety valve; after the battery is on fire, when the internal temperature of the battery exceeds a preset value, the magnetism of the first magnetic sensing piece and/or the second magnetic sensing piece is weakened or disappears, the elastic piece recovers to deform so that the fire baffle plate slides to the second position of the guide mechanism along the guide mechanism, the fire baffle plate positioned at the second position is used for blocking the valve port of the first safety valve, the valve port of the first safety valve is sealed, the contact between combustible materials inside the battery and air is isolated, the fire extinguishing effect is achieved, and therefore the safety of a user is guaranteed.

The first embodiment is as follows:

referring to fig. 1, in the present embodiment, a fire extinguishing apparatus for a battery top cover is provided, wherein a first safety valve 103 is generally disposed on a bottom plate 10 of the battery top cover, and the first safety valve 103 is communicated with an interior of a battery and is configured to open when a pressure difference between an inside and an outside of the battery is greater than a first threshold value, so as to release pressure of the battery, release gas inside the battery, and prevent the battery from further expanding to explode and ignite. However, when the first safety valve 103 is opened by an excessive internal pressure of the battery, the gas inside the battery is discharged at an extremely high speed with the electrolyte, and a strong friction is generated at the opening of the first safety valve 103. When the temperature generated by high-speed friction reaches the flash point of the electrolyte, the electrolyte can detonate, at the moment, although the battery cannot explode, the battery can continuously catch fire until the combustible in the battery is burnt, and thus, the fire can be caused, and the personal safety of a user can be threatened.

The fire extinguishing apparatus in this embodiment includes a guide mechanism and a fire damper plate 105 slidably mounted on the guide mechanism, the fire damper plate 105 being slidable along the guide mechanism; the magnetic shield further comprises an elastic piece 107, a first magnetic induction piece 106 and a second magnetic induction piece 100, wherein the first magnetic induction piece 106 is fixed on the top cover bottom plate 10, the first end of the elastic piece 107 is fixed on the first magnetic induction piece 106, the second end of the elastic piece 107 is connected with one end of the second magnetic induction piece 100, and the other end of the second magnetic induction piece 100 is fixedly connected with the fire shield 105. Under normal conditions, the second magnetic induction member 100 and the first magnetic induction member 106 attract each other to compress the elastic member, so that the fire damper plate 105 is located at the first position, and one end of the fire damper plate 105 located at the first position is adjacent to the first safety valve 103 and does not block the valve port of the first safety valve 103 (i.e., the valve port of the first safety valve 103 is exposed). When the first safety valve 103 is opened due to an excessive internal pressure of the battery, the gas inside the battery is released with the electrolyte at an extremely high speed, and a strong friction is generated at the opening of the first safety valve 103, when the temperature generated by high-speed friction reaches the flash point of the electrolyte, the electrolyte can explode, the battery can continuously catch fire all the time, so that the temperature at the valve opening of the first safety valve 103 is continuously increased, when the temperature of the battery exceeds a first preset value, the magnetism of the first magnetism-sensing member 106 and/or the second magnetism-sensing member 100 is weakened or lost, the elastic member 107 recovers deformation to make the fire damper 105 slide to a second position along the guide mechanism, the fire damper 105 at the second position is used for blocking the valve port of the first safety valve 103, the valve port of the first safety valve 103 is sealed, so that the contact between combustible materials in the battery and air is isolated, the fire extinguishing effect is achieved, and the safety of users is guaranteed. In this embodiment, the fire damper 105 needs to be located above the valve port of the first safety valve 103 to seal the valve port of the first safety valve 103 to effectively isolate air, thereby preventing the battery from burning continuously, and in some cases, if the valve port of the first safety valve 103 is located downward, the fire damper 105 needs to be located below the valve port of the first safety valve 103 to seal the valve port of the first safety valve 103 to effectively isolate air, thereby preventing the battery from burning continuously.

In other embodiments, the elastic member 107 may be located at the right side of the first safety valve 103 in a normal state, where the elastic member 107 is in a stretched state, for example, one end of the elastic member 107 is fixed on the top cover bottom plate 10, the other end is fixed with a first magnetic induction member 106, the second magnetic induction member 100 is disposed at an end close to the first magnetic induction member 106, the first magnetic induction member 106 and the second magnetic induction member 100 attract each other to stretch the elastic member 107 in a normal state, when the battery temperature exceeds a first preset value, the magnetism of the first magnetic induction member 106 and/or the second magnetic induction member 100 is weakened or lost, and the elastic member 107 recovers to deform so that the fire damper plate 105 slides along the guide mechanism to the second position of the guide mechanism.

In this embodiment, the first magnetic sensing member 106 is a permanent magnet, the second magnetic sensing member 100 is a temperature sensing soft magnet, the first magnetic sensing member 106 is fixed on the top cover bottom plate 10, the elastic member 107 includes two springs, a first end of each spring is fixedly connected to the first magnetic sensing member 106, and a second end of each spring is fixedly connected to one end of the second magnetic sensing member 100. When the battery works normally, when the temperature in the battery does not reach a preset value, the first safety valve 103 is in a closed state, the first magnetic induction piece 106 has high magnetism, so that the first magnetic induction piece 106 and the second magnetic induction piece 100 are mutually attracted, the second magnetic induction piece 100 compresses the elastic piece 107, so that the fire damper plate 105 is positioned at a first position, and at the moment, the right end of the fire damper plate 105 is adjacent to the left side of the first safety valve 103; when the first safety valve 103 is opened due to the excessive pressure inside the battery, the gas inside the battery is discharged at an extremely high speed with the electrolyte, and when fire is caused by intense friction generated at the first safety valve 103, the temperature of the battery reaches a second preset value, the second preset value is the curie temperature of the second magnetic sensing piece 100, at this time, the battery temperature reaches the curie temperature of the second magnetic sensing piece 100, the second magnetic sensing piece 100 is heated and magnetized to disappear, at this time, the attraction force between the first magnetic sensing piece 106 and the second magnetic sensing piece 100 disappears, the elastic piece 107 recovers deformation, the fire baffle plate 105 is pushed to slide to the second position along the guide mechanism, the fire baffle plate 105 located at the second position is used for blocking the valve port of the first safety valve 103, the valve port of the first safety valve 103 is sealed, so that the contact between combustible materials in the battery and air is isolated, the fire extinguishing effect is achieved, and the safety of users is guaranteed.

In other embodiments, the number of springs may be set as required, and it is only necessary to ensure that the elastic force generated when the deformation is recovered can push the fire damper plate 105 to the upper side of the first safety valve 103 to seal the safety valve port.

Wherein, when magnetism piece 100 was chosen to the second, it needs to be noticed that, its curie temperature can not hang down excessively or too high, and the curie temperature should be higher than the upper limit temperature when the battery normally used, and the minimum value of curie temperature should be higher than battery thermal runaway and trigger the critical value promptly, can guarantee this extinguishing device in time to start like this. Wherein, the second magnetic induction piece 100 can be selected from pure ferrite, magnetic steel and the like.

In other embodiments, one of the first magnetic sensing element 106 and the second magnetic sensing element 100 is a temperature-sensitive soft magnetic iron, and the other is an iron block or other conductive material capable of being attracted by a magnet, so as to achieve the technical effects of the present application. For example, the first magnetic sensing member 106 is a temperature-sensitive soft magnet, the second magnetic sensing member 100 is an iron block, or the first magnetic sensing member 106 is an iron block, and the second magnetic sensing member 100 is a temperature-sensitive soft magnet; or the first magnetic sensing member 106 is a temperature-sensitive soft magnet, and the second magnetic sensing member 100 is a permanent magnet.

The guide mechanism of the embodiment includes a first guide 104 and a second guide 109, and the first guide 104 and the second guide 109 are arranged in parallel on the top cover bottom plate 10 of the battery and are respectively located at two sides of the first safety valve 103 to guide and limit the fire damper 105.

Specifically, each of the first guide member 104 and the second guide member 109 is provided with a guide slot, as shown in fig. 3, the corresponding side surface of the fire damper plate 105 is provided with a first guide block 1051 and a second guide block 1052, respectively, and the first guide block 1051 and the second guide block 1052 are slidably mounted in the guide slots of the first guide member 104 and the second guide member 109, respectively.

Taking the first guide member 104 as an example, the guide slot 1041 of this embodiment is a trapezoidal slot, the first guide block 1051 and the second guide block 1052 are both trapezoidal blocks, the cross sections of the guide slot 1041, the first guide block 1051 and the second guide block 1052 are both trapezoidal, the cross sections are both narrow on the top and wide on the bottom, the first guide block 1051 and the second guide block 1052 are both trapezoidal convex on the fire damper plate 105, when the first guide block 1051 and the second guide block 1052 are installed in the guide slot 1041 on the first guide member 104 and the second guide member 109, the guide slot 1041 and the first guide block 1051 and the second guide block 1052 are in limit fit, and the first guide block 1051 and the second guide block 1052 are limited and guided. So that the fixed fire blocking plate 105 is normally moved in the guide slot 1041 and is not easily detached.

The guide slot 1041, the first guide block 1051 and the second guide block 1052 may be designed in other shapes to achieve the purpose of limiting and guiding.

Further, this extinguishing device is still including setting up a plurality of second relief valves 108 on fire damper 105, second relief valve 108 is used for automatic opening when the inside and outside pressure differential of battery is greater than the second threshold value for the inside pressure release of battery, when the battery after putting out a fire inside has stronger atmospheric pressure because of high temperature, second relief valve 108 on fire damper 105 can open under certain pressure, in order to reach the effect that lets the inside pressure release of battery, prevent that the battery from bursting, provide duplicate protection for the battery. In this embodiment, five rows of second safety valves 108 are uniformly disposed on the fire damper 105, and four safety valves are disposed in each row, so as to ensure timely pressure relief inside the battery and prevent the battery from bursting. The second threshold is smaller than the first threshold, and in this embodiment, the first threshold (0.9 ± 0.2) Mpa is (0.9 ± 0.2) Mpa, that is, the opening pressure of the first safety valve 103 is about 0.2Mpa, and the second threshold is about 0.2Mpa, that is, the opening pressure of the second safety valve 108 is about 0.2 Mpa. And the first relief valve 103 is a larger relief valve and the second relief valve is a smaller relief valve.

The first magnetic induction member 106 is fixed between the first pole 102 of the battery top cover bottom plate 10 and the first safety valve 103 near the first pole 102, and is fixed in a direction perpendicular to the top cover bottom plate 10. A second pole post 101 is disposed at the other end of the top cover bottom plate 10, wherein the first pole post 102 and the second pole post 101 are a positive pole post and a negative pole post, respectively.

In other embodiments, the first magnetic induction member 106 and the second magnetic induction member 100 of this embodiment can also be replaced by a fixing member, for example, a hot melt adhesive fixing member is selected, and in other embodiments, wax, solid adhesive, or a hot melt adhesive tape can also be selected. The hot melt adhesive, wax or hot melt adhesive tape will melt when the temperature reaches a certain value. For example, a fixing block is disposed on the bottom plate 10 of the top cover of the battery for fixing the first end of the elastic member 107, the second end of the elastic member 107 is fixed to the fire damper 105, the elastic member 107 is also a spring, the assembled battery applies an external force to the spring, and the inner and outer surfaces of the spring are coated with hot melt adhesive when the spring is in a compressed state. After the hot melt adhesive is cured, the spring is always in a compressed state, and the fire extinguishing plate 105 is fixed with one end of the spring, moves towards the fixed block under the action of the tensile force of the spring and is fixed at a normal position. When the battery is in a normal condition, the spring is in a compressed state, and the fire damper plate 105 is in a normal position (i.e., a first position) tangential to the valve port of the first safety valve 103. The fire damper 105 is only in tangential contact with the first safety valve 103 and does not block the valve port of the first safety valve 103, thereby not affecting the normal use of the battery. When the battery causes the first safety valve 103 to be opened and fire due to the overlarge internal pressure of the battery under the abnormal working condition, the temperature of the battery rises suddenly, when the softening temperature of the hot melt adhesive is reached, the hot melt adhesive is heated and softened, the hot melt adhesive does not have the previous adhesive strength any more, and the spring is lengthened and is recovered to the normal state. Generally, a hot melt adhesive, wax or hot melt adhesive tape melts at 100 ℃, and the spring recovers its shape. The fire damper 105 starts to move toward the valve port of the first safety valve 103 under the elastic force of the spring and the guiding action of the guide groove 1041, and when reaching a predetermined position (i.e., the second position), the fire damper just seals the entire valve port of the first safety valve 103. The inside of the battery is isolated from the outside air immediately, and the combustible substances in the battery do not burn any more, so that the fire extinguishing effect is achieved, and the personal safety of a user is guaranteed.

The fire damper 105 is made of metal or other materials with a high melting point and is not easily deformed at high temperature, such as a metal sheet or a flame retardant sheet with a high melting point, and it is required to ensure that the height of the fire damper 105 relative to the battery top cover bottom plate 10 is the same as or slightly greater than the height of the valve port of the first safety valve 103 and the height of the top cover bottom plate 10 as much as possible during design, so as to ensure that the fire damper 105 has a good sealing effect when sliding to the valve port of the first safety valve 103.

The extinguishing device of this embodiment can be when the battery takes place thermal runaway automatic start, plays sealed effect to the valve port of first relief valve 103, and the contact of the inside combustible substance of isolated battery and air reaches the effect of putting out a fire to this guarantees user's safety. Meanwhile, the second safety valve 108 on the fire damper 105 is opened under a certain pressure, so as to achieve the effect of relieving the pressure inside the battery, prevent the battery from bursting, and provide double protection for the battery. Compared with the existing device which needs to adopt gas to trigger fire extinguishing, the mode has the advantages of more sensitive triggering and higher safety.

Example two:

the embodiment provides a battery top cover, and this battery top cover includes top cover bottom plate 10, installs first relief valve 103 on the top cover bottom plate 10, and first relief valve 103 communicates with the inside of battery for open when the inside and outside pressure differential of battery is greater than first threshold value, make the battery pressure release, prevent the battery explosion.

Further, the fire extinguishing device as described in the first embodiment is further installed on the top cover bottom plate 10, so that the battery top cover can seal the valve port of the first safety valve 103 when the battery is out of thermal runaway, so as to isolate the contact between the combustible inside the battery and the air, thereby achieving the fire extinguishing effect and ensuring the safety of the user. Meanwhile, the second safety valve 108 on the fire damper 105 is opened under a certain pressure, so as to achieve the effect of relieving the pressure inside the battery, prevent the battery from bursting, and provide double protection for the battery. Simultaneously this trigger mode and current need adopt gaseous device that triggers to put out a fire to compare, trigger more sensitively, and the security is higher.

EXAMPLE III

The embodiment provides a battery, a fire extinguishing device as in the first embodiment is arranged on a battery top cover of the battery, or the battery adopts the battery top cover as in the second embodiment, and when thermal runaway occurs, the battery can be firstly decompressed through a first safety valve 103, so that the battery is prevented from expanding and exploding. When the first safety valve 103 is opened due to the overlarge internal pressure of the battery and fierce friction is generated at the position of the opening of the first safety valve 103, the fire extinguishing device on the top cover of the battery is automatically started to seal the valve port of the first safety valve 103, so that the contact between combustible materials in the battery and air is isolated, the fire extinguishing effect is achieved, and the safety of a user is ensured. Meanwhile, the second safety valve 108 on the fire damper 105 is opened under a certain pressure, so as to achieve the effect of relieving the pressure inside the battery, prevent the battery from bursting, and provide double protection for the battery. Compared with the existing device which needs to adopt gas to trigger fire extinguishing, the trigger mode has more sensitive triggering, so that the safety of the battery is higher.

It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.

Claims

1. A fire extinguishing apparatus for a battery top cover is provided with a first safety valve, the first safety valve is communicated with the interior of a battery and is used for opening when the pressure difference between the interior and the exterior of the battery is larger than a first threshold value so as to release the pressure of the battery, and the fire extinguishing apparatus is characterized by comprising a guide mechanism and a fire damper plate slidably mounted on the guide mechanism;

the magnetic sensor also comprises an elastic piece, a first magnetic induction piece and a second magnetic induction piece; at least one of the first magnetic induction piece and the second magnetic induction piece has magnetism, and the other one can be attracted by magnetism; the first end of the elastic piece is relatively fixed, the second end of the elastic piece is connected with one end of the second magnetic induction piece, and the other end of the second magnetic induction piece is connected with the fire baffle;

2. The fire extinguishing apparatus of claim 1, wherein one of the first and second magnetic sensing members is a temperature sensitive soft magnet, and the other is a permanent magnet, an iron block, an electromagnet, or a temperature sensitive soft magnet.

3. The fire extinguishing apparatus of claim 1, wherein the guide mechanism comprises a first guide member and a second guide member for being disposed in parallel on the battery top cover and respectively located at both sides of a valve port of the first safety valve to guide and restrain the fire damper; the first position is adjacent to the port of the first relief valve and the second position is above or below the port of the first relief valve.

4. The fire extinguishing apparatus of claim 3, wherein the first and second guide members each have a guide groove, and the fire damper has first and second guide blocks on respective sides thereof, the first and second guide blocks being slidably mounted in the guide grooves of the first and second guide members, respectively.

5. The fire extinguishing apparatus of claim 4, wherein the guide groove is a trapezoidal groove, and the first and second guide blocks are trapezoidal blocks.

6. The fire suppression apparatus of claim 1, further comprising a plurality of second safety valves disposed on the fire shield, the second safety valves adapted to automatically open to allow internal venting of the battery when a pressure differential between the interior and the exterior of the battery is greater than a second threshold.

7. The fire suppression apparatus of claim 1, wherein the resilient member comprises at least one spring.

8. The fire suppression apparatus of claim 1, wherein said first magnetic sensing member is secured to said battery top cover and a first end of said resilient member is secured to said first magnetic sensing member.

9. A battery top cover comprises a top cover bottom plate, wherein a first safety valve is mounted on the top cover bottom plate, communicated with the interior of a battery and used for opening when the pressure difference between the interior and the exterior of the battery is larger than a first threshold value, so that the battery is decompressed; characterized in that the top cover bottom plate is also provided with a fire extinguishing device according to any one of claims 1 to 8.

10. A battery, characterized in that the battery comprises a fire extinguishing device according to any one of claims 1-8 or a battery top cover according to claim 9.